Portion of a vent



FIG. 1 is a top perspective view of a portion of a vent illustrating mynew design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom perspective view thereof.

CLAIM The ornamental design for a portion of a vent, as shown anddescribed.